ST. CATHARINES, Ont. -- Police are searching for two suspects after six people were shot outside a nightclub in southwestern Ontario early Sunday.

Niagara regional police say two male suspects got into a dispute at about 2:30 a.m. and began shooting at each other on the busy downtown street outside the club in St. Catharines, Ont.

Spokeswoman Stephanie Sabourin says four men and two women were sent to hospital with gunshot wounds.

Two were seriously wounded, but Sabourin says all of the injured are expected to survive.

Investigators say they still don't know whether the injured knew the shooters, or if they were merely caught in the crossfire.

Police say the suspects should be considered armed and dangerous.

Sabourin says the shooting happened just after last call, when hundreds of people were on the downtown streets.

Police are urging anyone who may have seen or heard something to come forward.

Police Chief Bryan MacCulloch says he understands the concerning nature of the incident, and he's on his way back to the region to provide whatever support he can offer.

This report by The Canadian Press was first published on Sept. 29, 2019.